Fostex 6301NX Powered D-Class Confidence Monitor (Transformer Balanced Inputs)6301NX model with transformer balanced TRS inputs. Model 6301 series have been on the market since 1982 as the standard active monitor speaker in the broadcast and production facilities and now we have re design the speakers with the latest D class power amplifier and new driver unit featuring energy saving "auto stand by" function. Features: 20W D class power amplifier for higher output level and less power consumption with no heat sink Dedicated 4